Two-tier server



FIG. 1 is a perspective view of a two-tier server a new design;

FIG. 2 is a front view of the two-tier server of FIG. 1;

FIG. 3 is a rear view of the two-tier server of FIG. 1;

FIG. 4 is a side view of the two-tier server of FIG. 1;

FIG. 5 is a top view of the two-tier server of FIG. 1; and,

FIG. 6 is a bottom view of the two-tier server of FIG. 1.

The components of the display shown in broken lines illustrate portions of the two-tier server form no part of the claimed design. 

CLAIM The ornamental design for a two-tier server, as shown and described. 